unit-test-boundary-conditions

To write unit tests for boundary conditions in Java, use JUnit 5 with AssertJ to validate minimum and maximum values, null inputs, empty collections, and numeric precision limits. This approach provides clear patterns for testing edge cases across various data types.

Common edge cases in unit testing include null inputs, empty collections, minimum and maximum numeric values, and special date or string values. Testing these limits ensures your code correctly handles unexpected data and prevents overflow or precision errors.

Test financial calculations for numeric precision and overflow errors by applying unit test patterns that specifically target the smallest and largest possible currency values. Using JUnit 5 and AssertJ ensures your limits are validated correctly.

No, this skill provides examples focused exclusively on pure JUnit 5 with AssertJ. It does not provide examples for other testing frameworks, ensuring the test cases remain clear and maintainable within this specific Java testing ecosystem.

The best way to structure maintainable tests for edge cases is using AssertJ assertions combined with JUnit 5. This combination provides clear, readable test patterns for verifying limits, null inputs, and special values across numerics, strings, collections, and dates.